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Lanthanide complexes with a tripodal nitroxyl radical showing strong magnetic coupling.pdf (1.2 MB)
Lanthanide Complexes with a Tripodal Nitroxyl Radical Showing Strong Magnetic Coupling
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
revised on 15.08.2020 and posted on 17.08.2020by Mauro Perfetti, Andrea Caneschi, Taisiya S. Sukhikh, Kira E. Vostrikova
A series of isomorphous mononuclear complexes of Ln(III) ions comprising one stable
tripoidal oxazolidine nitroxyl radical were obtained in acetonitrile media
starting from nitrates. The compounds, [LnRad(NO3)3]
(Ln = Gd, Tb, Dy, Tm, Y; Rad = 4,4-dimethyl-2,2-bis(pyridin-2-yl)-1,3-oxazolidine-3-oxyl),
have molecular structure. Their coordination
can be described as a tricapped trigonal prism with symmetry close to D3h. The value of 23 cm-1 for the
antiferromagnetic coupling Gd-Rad established from the DC magnetic and EPR data is a record strength for the complexes of
4f-elements with nitroxyl radicals. The terbium derivative displays
frequency-dependent out-of-phase signals in zero field indicating
single-molecule magnetic behavior with an effective barrier of 57 cm-1.